JP2009265617A - Lens driving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving apparatus can prevent unstable magnetic operation characteristics. <P>SOLUTION: The lens driving apparatus 1 includes a sleeve 13, a support (such as a yoke 11) that supports the sleeve 13 via a spring member (first flat spring 14), coils 18 attached to the sleeve 13, and magnets 17 attached to the support. In the lens driving apparatus 1, the support is provided with the yoke 11 and a cover portion 12, the yoke 11 being formed with a light-entrance window 111 for collecting light reflected from a subject to a lens, and the cover portion 12 being attached to the inside of the light-entrance window 111; the cover potion 12, the spring member, and the magnets 17 are arranged so that they are layered in this order from the light-entrance window 111, and the cover portion 12 is formed of a non-magnetic material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens driving device that forms an image of a subject by driving a lens in the direction of an optical axis.

  In recent years, as camera-equipped mobile phones equipped with cameras have become popular, opportunities for photographing various subjects using the mobile phones have increased. For example, you can shoot a subject that is far away from the camera lens, such as a friend or landscape (normal shooting), or a subject that is close to the camera lens, such as a bus timetable or petals (close-up shooting) There is a case.

  In close-up photography (macro photography), the lens position of the camera needs to be slightly closer to the subject side than the lens position during normal photography. For this reason, this type of photographic lens system includes a drive mechanism that drives the lens to move in the direction of the optical axis, so that the lens can be moved in the direction of the optical axis by driving the drive mechanism by switching a switch. (For example, refer to Patent Document 1).

  The lens driving device disclosed in Patent Document 1 includes a holder, a yoke that supports the holder so as to be displaceable in the optical axis direction, and a pair of leaf springs that sandwich the holder in the vertical direction. In such a configuration, while supplying an electric current to the coil to generate an electromagnetic force, a restoring force opposite to the electromagnetic force is generated by a leaf spring, and the size of both is adjusted to control the position of the holder. .

  Here, the yoke described above is made of a magnetic material so as to function as a part of the magnetic circuit. In order to increase the magnetic efficiency as much as possible, the top surface portion (front end surface opposite to the imaging device) of the lens driving device is also made of a magnetic material.

JP 2006-259032 A

  However, with the configuration as described above, when the holder moves in the optical axis direction (when it moves perpendicularly to the above-described top surface portion), the amount of movement of the sleeve when current is passed through the coil is insignificant. There is a risk of becoming stable.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a lens driving device capable of preventing the amount of movement of the sleeve from becoming unstable when a current is passed through the coil. It is in.

  In order to solve the above problems, the present invention provides the following.

  (1) A movable body that holds the lens and is movable in the optical axis direction, a support that supports the movable body via a spring member, a coil that is attached to the movable body, and an attachment that is attached to the support. A lens driving device that forms a subject image by driving the lens in the direction of the optical axis, and the support is a yoke formed with an incident window for taking reflected light from the subject into the lens. And a cover portion attached to the inside of the incident window, and the cover portion, the spring member, and the magnet are arranged in an overlapping order from the side close to the incident window, and the cover A lens driving device characterized in that the portion is made of a non-magnetic material.

  According to the present invention, in a lens driving device provided with a moving body, a support body, a coil, and a magnet, as a support body, a yoke having an incident window formed thereon, and a cover portion attached inside the incident window; ,have. The cover portion, the spring member, and the magnet are arranged in this order from the side close to the entrance window, and the cover portion is formed of a nonmagnetic material. Since it does not flow to the cover part and the coil linkage magnetic flux becomes substantially constant in the moving range of the sleeve, the linearity in the driving range of the moving body can be improved. Furthermore, the presence of the cover portion can prevent the moving body from being too close to the yoke (magnetic body) constituting the edge of the incident window, and thus can prevent the magnetic operating characteristics from becoming unstable.

  Here, the type of “nonmagnetic material” does not matter. For example, it may be a metal-based material having no (or little or no) magnetism, or a resin-based material having no (or little or no) magnetism.

  (2) The magnet is magnetized so that the inner surface and the outer surface are different from each other in the radial direction, and two different poles are adjacent to each other in the optical axis direction, and the coil has a diameter different from that of the magnet. The first coil on the subject side and the second coil on the image sensor side, which face each other in the direction, are arranged so that the winding direction is reversed and adjacent in the optical axis direction, and the movable distance in the optical axis direction of the movable body A distance restricting the moving body by the position restricting member is the same as the distance in the optical axis direction from the subject side end position of the second coil to the magnetized dividing line. Or a short lens driving device.

  According to the present invention, the position regulating member that regulates the movable distance in the optical axis direction of the movable body is provided, and the distance that regulates the movable distance in the optical axis direction of the movable body by the position regulating member is the subject of the second coil. Since the distance is less than or equal to the distance in the optical axis direction from the side end position to the magnetized dividing line, when the moving body moves to the subject side, the second coil is positioned adjacent to the magnet in the optical axis direction. Since it does not overlap with the subject-side magnet, thrust in the reverse direction is not generated. Therefore, the linearity in the driving range of the moving body can be improved.

  (3) The lens driving device, wherein the position regulating member is the cover portion or the yoke.

  According to the present invention, by using the position restricting member as the cover portion or the yoke, it is possible to prevent the moving body from being too close to the cover portion or the yoke, and thus it is possible to prevent instability of the magnetic operating characteristics.

  (4) A magnetic member is attached to a subject-side end surface of the moving body, and the magnetic member is disposed between the cover portion and a driving portion including the coil and the magnet. A lens driving device.

  According to the present invention, a magnetic member is attached to the subject-side end surface of the moving body described above, and the magnetic member is disposed closer to the entrance window than the drive unit. Can be magnetically attracted to the image sensor side to prevent the moving body from wobbling when the moving body is stationary (macro photography).

  (5) A lens driving device characterized in that a magnetic member is attached to the subject-side end surface of the moving body, and the magnetic member is annular.

  According to the present invention, the magnetic member attached to the subject-side end surface of the moving body prevents the moving body from wobbling when the moving body is stationary (macro shooting) by magnetically attracting the moving body to the imaging element side. Can do. In addition, since the magnetic member has an annular shape, a substantially uniform attractive force can be generated over the entire circumference, and tilting of the moving body can be prevented.

  (6) The yoke includes a top surface portion on which the incident window is formed and a back yoke portion that covers an outer peripheral side of the movable body, and both are connected so as to be substantially orthogonal to each other. A lens driving device.

  According to the present invention, the yoke described above is composed of a top surface portion on which the incident window is formed and a back yoke portion covering the outer peripheral side of the moving body, and both are connected so as to be substantially orthogonal. The leakage magnetic flux from the magnetic path can be reduced, and the linearity of the moving body can be improved. That is, when a yoke having a substantially L-shaped cross section is used, there is a property that magnetic flux is likely to be disturbed. However, in the present invention, since the cover portion is made of a nonmagnetic material, the magnetic flux emitted from the magnet is reduced. Since it does not flow to the cover part and the coil linkage magnetic flux becomes substantially constant in the moving range of the sleeve, it can contribute to improvement of linearity. In addition, compared with a yoke (having an inner yoke) having a substantially U-shaped cross-section, it is possible to prevent expansion in the radial direction by the amount not provided with the inner yoke, thereby contributing to downsizing of the apparatus. it can.

  Here, the material of the “top surface portion” and the “back yoke portion” is not particularly limited. For example, different materials may be used, or the same material may be used. When the same material is used, both are integrally formed, and as a result, the number of parts can be reduced.

  (7) The lens driving device, wherein the cover portion is positioned in the optical axis direction by the top surface portion, and is positioned in a direction orthogonal to the optical axis direction by the back yoke portion.

According to the present invention, the cover portion described above is positioned in the optical axis direction by the top surface portion and is positioned in the direction orthogonal to the optical axis direction by the back yoke portion. Workability can be improved. Moreover, the cover part can be used also as a stopper by positioning the cover part by the top surface part.

  According to the lens driving device of the present invention, since the cover portion made of a non-magnetic material is provided, it is possible to prevent the magnetic flux from the magnet from flowing to the cover portion, and thus magnetic operating characteristics. Can be prevented from becoming unstable. Moreover, since the position control member which controls the movable distance in the optical axis direction of a moving body is provided, it can contribute to the linearity improvement of a moving body.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Machine configuration]
FIG. 1 is a perspective view showing an external configuration of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a mechanical configuration of the lens driving device 1 according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing a state when the lens driving device 1 is cut in the direction of the optical axis L of the lens.

  1 to 3, the lens driving device 1 includes a yoke 11, a cover portion 12, a sleeve 13, a first plate spring 14, a second plate spring 15, a wire spring 16, and a magnet 17. , The coil 18 (the first coil 181 and the second coil 182) and the holder 19, and the lens is displaced in the optical axis L direction to form an image of the subject.

  Note that the illustration of a lens barrel (lens barrel) incorporating a lens is omitted. The lens driving device 1 also moves the sleeve 13 along the direction of the optical axis L in the A direction (front side) approaching the subject (imaging target) and the B direction (rear side) approaching the opposite side (image side) from the subject. (See FIG. 1). The sleeve 13 holding a lens barrel (not shown as described above) in which one or more lenses are incorporated is configured to be movable in the direction of the optical axis L together with the wire spring 16 and the like. It corresponds to an example of “moving body”. Further, the yoke 11, the cover portion 12, the holder 19, and the like are “supporting bodies” that support the sleeve 13 and the like movably in the direction of the optical axis L via the first plate spring 14 and the second plate spring 15. It corresponds to an example. The sleeve 13 and the like are driven in the direction of the optical axis L by a coil 18 attached to the “moving body” and a magnet 17 attached to the “support”. The yoke 11 is an iron-based steel plate, and the wire spring 16 is a SUS304 system. Further, the cover part is formed of a SUS304 system.

  The yoke 11 is exposed at the front and side surfaces of the lens driving device 1, and a top surface portion 11a is formed in the center of which a circular incident window 111 is formed for taking reflected light from the subject into the lens. Further, the yoke 11 has a back yoke portion 11 b that covers the outer peripheral side of the sleeve 13. The top surface portion 11a and the back yoke portion 11b are connected so as to be approximately orthogonal. In the present embodiment, since these are made of the same material, they are integrally formed.

  The cover portion 12 is attached to the yoke 11 inside the entrance window 111 formed on the top surface portion 11a. At the center, a circular window is formed for taking reflected light from the subject into the lens. The holder 19 holds an image sensor (not shown) on the image side.

  The coil 18 is composed of a first coil 181 and a second coil 182, which are arranged in two stages in the direction of the optical axis L, both of which are annular, and each winding direction is reversed. Yes. Then, it is wound around the outer peripheral surface of the sleeve 13 at a predetermined interval. In addition, eight magnets 17 are arranged in two stages in the optical axis direction. The magnets 17 of each stage are arranged such that the front magnet 17 is against the first coil 181 and the rear magnet 17 is the first. The two coils 182 are opposed to each other on the outer peripheral side, and are fixed to four corners of the inner peripheral surface of the yoke 11 whose outer shape is substantially rectangular as shown in FIG.

  In the present embodiment, the magnet 17 is magnetized to poles whose inner surface and outer surface are different from each other. For example, the four magnets 17 arranged on the front side are magnetized with the N pole on the inner surface, the outer surface is magnetized with the S pole, and the four magnets 17 arranged on the rear side have an S inner surface. The pole is magnetized and the outer surface is magnetized to the N pole. With this configuration, thrust on the subject side is generated by the front magnet 17 and the first coil 181, and the second coil in which the winding direction of the rear magnet and the first coil is reversed is also on the subject side. To generate thrust.

  The first plate spring 14 and the second plate spring 15 are both formed from a thin metal plate and have the same thickness in the direction of the optical axis L. The first leaf spring 14 is attached to the front end surface (A side in FIG. 1) of the sleeve 13 in the optical axis L direction, and the second leaf spring 15 is the rear end surface of the sleeve 13 in the optical axis L direction. (B side in FIG. 1). The second leaf spring 15 is composed of two electrically separated spring pieces and serves as a medium for supplying current from the external power source to the coil 18. The spring end is electrically connected to the other spring piece.

  Since the yoke 11 is larger than the dimension in the optical axis direction of the region where the first coil 181 and the second coil 182 are arranged, and the dimension in the optical axis direction of the magnet 17, the front magnet 17. Leakage flux from the magnetic path configured between the first coil 181 and the magnetic path configured between the rear magnet 17 and the second coil 182 can be reduced. As a result, the linearity between the amount of movement of the sleeve 13 and the current flowing through the first coil 181 and the second coil 182 can be improved.

  The lens driving device 1 includes an annular wire spring 16. The wire spring 16 is an example of a magnetic member, and is attached to the subject side end surface (front end surface) of the sleeve 13. The wire spring 16 applies a biasing force in the direction of the optical axis L to the sleeve 13 by a magnetic attractive force acting between the wire spring 16 and the magnet 17. For this reason, it is possible to prevent the moving body (sleeve 13 or the like) from being displaced by its own weight when the coil is not energized, and as a result, the moving body (sleeve 13 or the like) can be maintained in a desired posture. Yes. In this way, impact resistance is improved.

  Here, the lens driving device 1 according to the present embodiment is characterized in the configuration and the arrangement relationship of the cover unit 12 described above. More specifically, the cover part 12 can regulate the movable distance in the optical axis direction of the moving body in the direction of the optical axis L, and is formed of a nonmagnetic material. And this cover part 12, the 1st leaf | plate spring 14, and the magnet 17 are piled up in this order from the side (A side in FIG. 1) near the entrance window 111 (FIG. 3). reference). Therefore, the sleeve 13 is prevented from being too close to a magnetic body such as the top surface portion 11a. Here, when the cover part 12 is a magnetic body, a part of the magnetic flux is directed to the cover part 12 from the subject side end of the magnet 17, and the magnetic flux originally linked to the coil is reduced. Since the inner surface of the magnet on the subject side does not face the coil at the position where the sleeve 13 starts to move, this magnetic flux reduction has little effect. As much as it flows to the portion 12, the coil linkage magnetic flux decreases and the thrust decreases. As a result, the linearity between the amount of movement of the sleeve 13 and the current supplied to the coil is deteriorated. On the other hand, when the cover portion 12 is made of a non-magnetic material, a part of the magnetic flux does not go to the cover portion 12 from the subject side end of the magnet 17, so that the coil interlinkage magnetic flux is within the moving range of the sleeve 13. It becomes almost constant. Further, the distance b that restricts the movable distance of the moving body in the optical axis direction by the cover portion is equal to or less than the distance a in the optical axis direction from the subject side end position of the second coil to the magnetized dividing line ( a ≧ b, see FIG. 9), when the moving body moves to the subject side, the second coil does not overlap with the subject-side magnet among the magnets arranged adjacent to the optical axis direction. No thrust is generated. Therefore, linearity can be improved.

  Further, since the wire spring 16 described above is disposed closer to the incident window 111 than the first plate spring 14 (see FIG. 3), the wire spring 16 is caused by the magnetic attraction force with the magnet 17 to be the first plate spring. 14 can be acted so as to bend more reliably and urged in the direction of the optical axis L.

[Assembly procedure]
A procedure for assembling the lens driving device 1 will be described. In particular, the manner in which the cover 12, the first leaf spring 14, and the magnet 17 are overlaid will be described in detail with reference to FIGS. 4 to 7. FIG. 4 is a diagram illustrating a state when focusing on the yoke 11 (the top surface portion 11a and the back yoke portion 11b) in the lens driving device 1. FIG. 5 is a perspective view showing a state when the cover portion 12 is placed on the yoke 11. FIG. 6 is a perspective view showing a state when the cover portion 12 and the first leaf spring 14 are placed on the yoke 11. FIG. 7 is a perspective view showing a state where the cover 12 and the first leaf spring 14 are placed on the yoke 11 and then the magnet 17 is attached. In addition, about the assembly procedure of the lens drive device 1, you may carry out by mechanical industry or you may carry out by hand industry.

  In FIG. 4, first, the yoke 11 with the rear side up is placed on the work table (FIG. 4 (a) → FIG. 4 (b)). Specifically, it mounts upside down so that the top surface part 11a, that is, the upper surface (front side surface) in the optical axis L direction becomes the bottom surface. Next, the cover portion 12 is placed inside the yoke 11. Specifically, this is as shown in FIG. At this time, an adhesive may or may not be used. Further, the positioning in the radial direction is performed simultaneously with the placement by the back yoke portion 11b of the yoke 11. In addition, positioning in the optical axis direction is performed simultaneously with the placement by the top surface portion 11a of the yoke 11. Then, the 1st leaf | plate spring 14 is attached from on the cover part 12 (refer FIG. 6). Also at this time, the radial direction of the first leaf spring 14 is positioned by the back yoke portion 11b, and the optical axis direction is positioned by the cover portion 12 disposed substantially parallel along the top surface portion 11a. In addition, these positioning is performed simultaneously with mounting.

  Next, the magnet 17 is attached from above the first leaf spring 14. Specifically, it is as shown in FIG. At this time, the positioning in the radial direction is performed simultaneously with the attachment by the back yoke portion 11b of the yoke 11.

  On the other hand, the coil 18 is wound around the sleeve 13, the second leaf spring 15 is attached to the rear end surface of the sleeve 13, and the holder 19 is attached to the sleeve 13 so as to sandwich the second leaf spring 15. As a result, the sleeve set is completed. This sleeve set is inserted from the rear side of the yoke 11 shown in FIG.

  Finally, the wire spring 16 is inserted into the yoke 11 from the entrance window 111 (front side) of the top surface portion 11a. Therefore, in the lens driving device 1 according to this embodiment, the diameter of the entrance window 111 is larger than the diameter of the wire spring 16. Accordingly, the wire spring 16 can be inserted at the final stage of the assembly procedure, and as a result, the degree of work freedom can be increased. In addition, since the wire spring 16 can be easily inserted through the entrance window 111 of the top surface portion 11a, it is possible to respond quickly even if there is a sudden design change (due to a customer request or the like).

[basic action]
In the lens driving device 1 according to the present embodiment, the moving body is normally located on the image sensor side (image side) (when the first coil 181 and the second coil 182 are not energized). At this time, the wire spring 16 regulates the displacement of the moving body by a magnetic attractive force acting between the wire 17 and the magnet 17. However, since the distance between the wire spring 16 and the magnet 17 is maintained to some extent, the magnetic attractive force between the wire spring 16 and the magnet 17 does not become too strong. As a result, it is possible to prevent the center axis of the moving body from being shifted, and thus to prevent the tilt characteristics from deteriorating.

  In such a state, when a current is passed through the first coil 181 and the second coil 182, the first coil 181 and the second coil 182 receive an upward (front) electromagnetic force, respectively. As a result, the first coil 181, the second coil 182, and the sleeve 13 begin to move toward the subject side (front side).

  At this time, an elastic force that restricts the movement of the sleeve 13 is generated between the first leaf spring 14 and the front end of the sleeve 13 and between the second leaf spring 15 and the rear end of the sleeve 13. . For this reason, when the electromagnetic force that moves the sleeve 13 forward and the elastic force that restricts the movement of the sleeve 13 are balanced, the sleeve 13 stops. In addition, when a reverse current is passed through the first coil 181 and the second coil 182, the first coil 181 and the second coil 182 receive a downward (rear) electromagnetic force, respectively. .

  At that time, by adjusting the amount of current flowing through the first coil 181 and the second coil 182 and the elastic force acting on the sleeve 13 by the first leaf spring 14 and the second leaf spring 15, the sleeve 13 (moving) Body) can be stopped at a desired position. In addition, by stopping the sleeve 13 using the balance between the electromagnetic force and the elastic force, unlike the case where the members are brought into contact with each other so as to be locked with the locking portion or the like, it is possible to prevent occurrence of a collision sound. .

[Main effects of the embodiment]
According to the lens driving device 1 according to the present embodiment, the movable distance in the optical axis direction of the moving body can be regulated by the presence of the cover portion 12 formed of a nonmagnetic material, and the moving body moves to the subject side. When this is done, the second coil does not overlap with the subject side magnet among the magnets arranged adjacent to each other in the optical axis direction, so that it is possible to prevent generation of thrust in the reverse direction (while exhibiting a stopper function). Since the magnetic flux emitted from the magnet does not flow to the cover part and the coil linkage magnetic flux becomes substantially constant in the moving range of the sleeve, the linearity in the driving range of the sleeve 13 can be improved.

  Further, the work efficiency can be improved by sandwiching the cover portion 12 between the top surface portion 11a of the yoke 11 and the first leaf spring 14 (magnet 17) (see FIGS. 5 to 7).

  Further, by using a non-magnetic material that is inexpensive and easy to process, such as a resin, as the material of the cover portion 12, the product cost can be reduced and a complicated shape can be dealt with.

  Further, the wire spring 16 that is separated from the magnet 17 as much as possible by interposing the first leaf spring 14 can prevent the sleeve 13 from wobbling when it is stationary and also prevent the magnetic flux from being disturbed.

  Further, in the present embodiment, the top surface portion 11a and the back yoke portion 11b are connected so as to be substantially orthogonal (as a result, the magnetic flux is likely to be disturbed), but the cover of the nonmagnetic material is used. Due to the presence of the portion 12, the magnetic flux emitted from the magnet does not flow to the cover portion, and the coil linkage magnetic flux can be made substantially constant in the moving range of the sleeve. In addition, since the yoke 11 does not have an inner yoke, it is possible to prevent the yoke 11 from expanding in the radial direction, thereby contributing to the downsizing of the apparatus.

  The lens driving device 1 can be attached to various electronic devices other than the camera-equipped mobile phone. For example, PHS, PDA, bar code reader, thin digital camera, surveillance camera, vehicle rear view confirmation camera, door with optical authentication function, and the like.

[Example]
FIG. 8 is a graph showing the amount of movement of the sleeve when a current is passed through the coil in the lens driving device according to the embodiment of the present invention. The broken line is when the cover portion is made of a magnetic material, and the solid line is when the cover portion is made of a nonmagnetic material.

  When the cover part is made of a magnetic material, the displacement with respect to the input current is smaller than 70 mA when compared with 40 mA to 60 mA, whereas when the cover part is made of a nonmagnetic material, the displacement is from 30 mA. In the vicinity of 70 mA, the displacement with respect to the input current is substantially linear. Therefore, it can be seen that the characteristics of the magnetic circuit are stabilized by using a nonmagnetic material for the cover portion.

  In addition, at the beginning of the movement of the moving body in which the sleeve moves toward the subject along the optical axis direction, the cover portion has substantially the same characteristics regardless of whether it is a magnetic material or a non-magnetic material (around 30 mA), but the moving body is the subject. When the cover is moved to the upper position and is in the upper position, even if the same current is applied, if the cover portion is a magnetic body, the amount of displacement is reduced by the amount of magnetic flux reduction, and it can be seen that the linearity is deteriorated. Such a tendency occurs when the sleeve moves toward the subject along the optical axis direction, or when the sleeve moves toward the imaging element along the optical axis direction. The same is true, and it can be seen that the characteristics of the magnetic circuit are more stable when the cover portion is made of a non-magnetic material than when the cover portion is made of a magnetic material.

  The lens driving device according to the present invention is useful for preventing instability of magnetic operating characteristics.

It is a perspective view which shows the external appearance structure of the lens drive device which concerns on embodiment of this invention. It is a disassembled perspective view which shows the machine structure of the lens drive device which concerns on embodiment of this invention. It is sectional drawing which shows a mode when a lens drive device is cut | disconnected in the optical axis direction of a lens. It is a perspective view when taking out only a yoke from a lens drive device. It is a perspective view which shows a mode when a cover part is mounted in the yoke. It is a perspective view which shows a mode when a cover part and a 1st leaf | plate spring are mounted in the yoke. It is a perspective view which shows a mode when a cover part and a 1st leaf | plate spring are mounted in a yoke, and a magnet is attached after that. 6 is a graph showing a moving amount of a sleeve when a current is passed through a coil in the lens driving device according to the embodiment of the present invention. It is a one-side cut sectional view of a lens drive device.

DESCRIPTION OF SYMBOLS 1 Lens drive device 11 Yoke 11a Top surface part 11b Back yoke part 12 Cover part 13 Moving body (sleeve)
14 First plate spring 15 Second plate spring 16 Wire spring 17 Magnet 18 Coil 19 Holder

Claims (7)

A movable body that holds the lens and is movable in the optical axis direction; a support that supports the movable body via a spring member; a coil that is attached to the movable body; and a magnet that is attached to the support. A lens driving device that forms an image of a subject by driving the lens in the direction of the optical axis.
The support includes a yoke on which an incident window for taking reflected light from a subject into a lens is formed, and a cover portion attached on the inner side of the incident window,
The cover unit, the spring member, and the magnet are arranged so as to overlap in order from the side close to the incident window, and the cover unit is made of a nonmagnetic material. The magnet is magnetized to have different polarities on the inner surface and outer surface in the radial direction, and arranged so that two different magnetized portions are adjacent in the optical axis direction,
The coil is disposed so that the first coil on the subject side and the second coil on the imaging element side facing each other in the radial direction are reversed in the winding direction and are adjacent in the optical axis direction.
A position regulating member that regulates a movable distance in the optical axis direction of the moving body,
The distance for restricting the moving body by the position restricting member is the same as or shorter than the distance in the optical axis direction from the subject side end position of the second coil to the magnetized dividing line. Item 2. The lens driving device according to Item 1.   The lens driving device according to claim 2, wherein the position restricting member is the cover portion or the yoke. A magnetic member is attached to the subject side end surface of the moving body,
The lens driving device according to claim 1, wherein the magnetic member is disposed between the cover portion and a driving portion including the coil and the magnet. A magnetic member is attached to the subject side end surface of the moving body,
The lens driving device according to claim 1, wherein the magnetic member has an annular shape.   The said yoke is comprised from the top | upper surface part in which the said incident window was formed, and the back yoke part which covers the outer peripheral side of the said mobile body, Both are connected so that it may orthogonally cross substantially. The lens driving device according to any one of 1 to 5.   The lens driving device according to claim 6, wherein the cover portion is positioned in the optical axis direction by the top surface portion, and is positioned in a direction orthogonal to the optical axis direction by the back yoke portion.

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